i'm steve kroft. in this edition, we look at three stories linked by the financial collapse of 2008. first, we examine a scam that's cost thousands of americans their homes. then we look into wall street's shadow market of credit default swaps. finally, a report on the perilous state of state finances. we begin with the foreclosure crisis. in the aftermath of the great recession, the huge number of foreclosed properties was a significant factor in weighing down the economy. many were stuck on the market for an unexpected reason: the banks couldn't find the ownership documents. as scott pelley first reported in april 2011, lenders wanting to evict people found that often, the legal documents behind the mortgages simply weren't there. caught in a jam of their own making, some companies appeared to have resorted to forgery to throw people down on their luck out of their homes. >> these folks on the street aren't homeless. they slept on the sidewalk because they want to keep their homes. facing foreclosur